diff --git a/ext/fileinfo/fileinfo.c b/ext/fileinfo/fileinfo.c
index f7868514531..90919e706e8 100644
--- a/ext/fileinfo/fileinfo.c
+++ b/ext/fileinfo/fileinfo.c
@@ -335,7 +335,7 @@ static void _php_finfo_get_type(INTERNAL_FUNCTION_PARAMETERS, int mode, int mime
 				break;
 
 			default:
-				zend_argument_type_error(2, "must be of type resource|string, %s given", zend_zval_type_name(what));
+				zend_argument_type_error(1, "must be of type resource|string, %s given", zend_zval_type_name(what));
 				RETURN_THROWS();
 		}
 
diff --git a/ext/fileinfo/tests/mime_content_type_001.phpt b/ext/fileinfo/tests/mime_content_type_001.phpt
index df7d3e4c5e9..38c136f3844 100644
--- a/ext/fileinfo/tests/mime_content_type_001.phpt
+++ b/ext/fileinfo/tests/mime_content_type_001.phpt
@@ -41,10 +41,10 @@ try {
 
 ?>
 --EXPECTF--
-mime_content_type(): Argument #2 must be of type resource|string, int given
-mime_content_type(): Argument #2 must be of type resource|string, null given
-mime_content_type(): Argument #2 must be of type resource|string, stdClass given
-mime_content_type(): Argument #2 must be of type resource|string, array given
+mime_content_type(): Argument #1 ($filename) must be of type resource|string, int given
+mime_content_type(): Argument #1 ($filename) must be of type resource|string, null given
+mime_content_type(): Argument #1 ($filename) must be of type resource|string, stdClass given
+mime_content_type(): Argument #1 ($filename) must be of type resource|string, array given
 
 Warning: mime_content_type(foo/inexistent): Failed to open stream: No such file or directory in %s on line %d
 mime_content_type(): Argument #1 ($filename) cannot be empty